Revert "Add Skia expectation for lines.pdf"

This reverts commit 43e99657252e0f8df03add433b372666bcf68a94.

Reason for revert: This file is based on an unmerged change.

Change-Id: Id2d352013cd08c9d1d4dffb08b1db7759b039a66
Reviewed-on: https://pdfium-review.googlesource.com/c/pdfium_tests/+/103430
Reviewed-by: K. Moon <kmoon@chromium.org>
Reviewed-by: Nigi <nigi@chromium.org>